title: [Clinical and endoscopic features of a selected population with serrated colorectal adenomas in a private clinic in Lima - Peru].
abstract: OBJECTIVE
  To describe the clinical and endoscopic caracteristics of a population that has only serrated polyps of colon (mainly sessile serrated adenomas) in a private clinic in Lima, Perú, from 2009-2011.
  
  
  METHODS
  Retrospective study conducted at the endoscopy center of Clinic Ricardo Palma, Lima, Peru. Olympus colonoscope was used with high definition, including NBI (narrow band imaging) and electronic magnification. Patients had pathologic diagnosis of â€œpolyps and / or colorectal serrated adenomasâ€ and excluded those with synchronous tubular or villous adenomas. Images were evaluated by two endoscopists and then by a third gastroenterologist.
  
  
  RESULTS
  We found 201 serrated polyps in 108 patients. Women were 60.2% and overweight predominated. Eighty (74.1%) had only one serrated adenoma and 23 (21.3%) with at least one synchronous hyperplastic polyp. The average size of sessile serrated adenomas was 5.12 mm (Â± 3.87 DS) and the flat type was 91 (58.7%). There were significant differences in the diameter of sessile serrated adenomas between the distal and proximal colon (4.47 mm Â± 2.23 vs. 6.90 mm Â± 6.25; p<0.000). The common features of sessile serrated adenomas were: White (31/36, 86.1%), smooth (28/36, 77.8%) and regular margins (26/36, 72.2%). There was a relationship between vascular pattern according NBI and serrated polyp histology (p=0.024).
  
  
  CONCLUSIONS
  The endoscopic features of sessile serrated adenomas can evade detection to white light. NBI is a useful tool to define some features of these lesions.
authors.affiliation: Hospital Edgardo Rebagliati Martins, EsSalud. Lima, Perú.
authors.forename: Ofelia
authors.initials: O
authors.lastname: Castillo
authors.forename: Carlos
authors.initials: C
authors.lastname: Barreda
authors.forename: Sixto
authors.initials: S
authors.lastname: Recavarren
authors.forename: José A
authors.initials: JA
authors.lastname: Barriga
authors.forename: Fernando
authors.initials: F
authors.lastname: Salazar M
authors.forename: Simón
authors.initials: S
authors.lastname: Yriberry
authors.forename: Eduardo
authors.initials: E
authors.lastname: Barriga
authors.forename: Fernando
authors.initials: F
authors.lastname: Salazar C
mesh_terms: D000236:Adenoma / Q000473:pathology*; D003111:Colonic Polyps / Q000473:pathology*; D003113:Colonoscopy; D015179:Colorectal Neoplasms / Q000473:pathology*; D005260:Female; D016304:Hospitals, Private; D006801:Humans; D008297:Male; D008875:Middle Aged; D010568:Peru; D012189:Retrospective Studies